NATE Air Conditioning 1

Question 1

What refrigerant is most commonly used in modern residential air conditioning systems in the US?

Accepted Answer

R-410A

Answer

R-22

Answer

R-134a

Answer

R-404A

Question 2

What is the purpose of the metering device in a refrigeration circuit?

Accepted Answer

Reduce refrigerant pressure and control flow into the evaporator

Answer

Compress the refrigerant

Answer

Remove heat from the condenser

Answer

Filter moisture from the refrigerant

Question 3

Which component in an air conditioning system is responsible for rejecting heat to the outdoors?

Accepted Answer

Condenser

Answer

Evaporator

Answer

Compressor

Answer

Expansion valve

Question 4

What does superheat measure in a refrigeration system?

Accepted Answer

Temperature rise of vapor above the saturation point at a given pressure

Answer

Temperature of liquid refrigerant leaving the condenser

Answer

Subcooling at the condenser outlet

Answer

Compressor discharge temperature

Question 5

What is the typical target evaporator superheat range for a fixed-orifice metering device system?

Accepted Answer

10–18°F

Answer

0–5°F

Answer

5–10°F

Answer

25–40°F

Question 6

Which tool is used to measure the wet-bulb temperature when evaluating air conditioning performance?

Accepted Answer

Sling psychrometer

Answer

Clamp meter

Answer

Manifold gauge set

Answer

Anemometer